Chain grate for furnaces



J. MALLINSON.

CHAIN GRATE FOR FURNACES.

APPLICATION FILED FEB. 13. 1911.

1,327,399, Patented Jan. 6,1920.-

2 SHEETS-SHEET I.

J. MALLINSON.

CHAIN GRATE FOR FURNACES.

APPLICATION FILED FEB. 13, 1917.

1,327,399, Patented Jan. 6,1920.

2 SHEETS-SHEET 2.

rm STATES osnrn MALLINSON, or oneseow, sco'rL un.

CHAIN GRATE FOB FURNACES.

Specification of Letters Patent.

Patented Jan. 6, 1920.

Application filed February 13, 1917. Serial No. 148,322.

To all whom it may concern:

Be it known that I, Josnrrr MALLINSON, a subject of the King of Great Britain, residing at Glasgow, Scotland, have invented certain new and useful Improvements in Chain Grates for Furnaces, of which the following is a specification.

This invention relates to chain grates of furnaces and particularly to the chain grates used in furnaces of Babcock & Wilcox and Stirling boilers. Owing to the construction of the links in the present grates great difliculty is experienced in removing and replacing a burned or broken link and the object of the present invention is to provide an improved construction of link which shall not only be capable of being readily fitted in position in the grate but also of being readily removed therefrom.

The present links have, usually, two eyes or holes through which the cross rods pass but, under my invention, instead ofhaving these eyes or holes I provide two open slots or hooks so made that the one can be caused to engage with one cross rod from above and the other the other cross rod from below and both being so shaped that, when engaged, the link will be securely locked or fastened in place.

The front slot in the link is inclined upwardly and then curved forwardly so as to form a hook which can embrace the front rod from above, while the back slot is first inclined or curved downwardly and then curved toward the rear so as to form a hook, with a forwardly projecting part or heel, adapted to embrace the back rod from below.

The link may be tilted and as to cause the back rod to enter then moved so the back slot and the front rod to enter the front slot, whereupon the link is turned down and moved to cause the front rod to engage the v front slot and then the rear part of the link is forced upward so that its heel or projection will spring over the back rod, (which yields slightly), and thereby lock the link securely in place. When the link is burned away and requires to be removed this can readily be done by breaking off the back hook without interfering with the rods or dismantling the stoker which is usually necessary at present and causes considerable trouble and expense.

By way of illustration or example I have shown, on the annexed drawings, one mode of constructing the improved link.

Figure 1 is a side elevation, and

Fig. 2 an inverted plan of the link as it appears when fitted on the pair of rods 00 of the chain grate.

Fig. 3 represents a transverse section of the grate,

As will be seen the link, a, which may be otherwise of usual construction, has two open slots 6, 0 the forward slot 0 being open at the bottom and curving upwardly and forwardly while the back slot b is open at the top and extends downwardly and rearwardly. Usually the rods m are about an inch in diameter and the slots may be 1%,

wide at the open ends and gradually diminish in width to 1 Owing to the shape of the slots two hooks cl, 0, areformed the hook e being adapted to pass over and engage one rod w from above and the hook (Z (with its heel (P) the other rod :0 from below. d is the heel which is adapted to be forced over the rod.

Having now fully described my invention what. I claim and desire to secure by Letters Patent is 1. A chain grate link made at one end with a downwardly and rearwardlyprojecting hook and at the other end with a downwardly, rearwardly and upwardly projeoting hook, said link being retained on the rods of the chain grate by elastic compression of the rods between said hooks.

2. A chain grate link made at its front end with a downwardly and rearwardly projecting hook and, at its rear end, with an upwardly projecting hook having an overhanging heel piece at its end and adapted to overhang the cross rod of the grate with which it cooperates.

3. The combination with a chain grate and its cross rods of a chain grate link made with hooks at its under side the one proj ecting downwardly and the other upwardly and the one hook being adapted to engage one cross rod and the other a second cross rod, said link being retained on said rods by the elastic compression of them between said hooks.

4. The combination with a chain grate 5 and its cross rods, of a link having at its front end a downwardly and rearwardly projecting hook on which one of the cross rods rests and having at its rear end a downwardly, rearwardly and upwardly in- 10 clined hook terminating in a heel which is adapted to be sprung over the juxtaposed cross rod and overhang such rod to retain the link in assembled position upon the chain grate.

In testimony whereof I aflix my signa- 15 ture in presence of two witnesses.

JOSEPH MALLINSON. .Witnesses:

WM. A. CALLANDER, JAs. GALBRAITH. 

